空ろの箱と零のマリア [Utsuro no Hako to Zero no Maria] Series by Eiji Mikage

Kazuki Hoshino leads the easy-going life of a typical high school student--until the appearance of a new girl in his class turns his world upside down! Introducing herself with a promise to "break" Kazuki is abnormal enough to make an impression, sure, but why does she seem so familiar...?

When your world is crashing down around you... who can you turn to?Nothing is more important to Kazuki Hishino than his normal, everyday life. But his friends are accusing him of committing offenses he doesn't remember, and his closest relationships are crumbling one by one. Soon, the life he knows will vanish forever.If a Box is involved, as he suspects, Maria is his most valuable ally... but how will he keep from losing her, too?

Can you do what it takes to survive?This time, Kazuki and Maria find themselves trapped in a game of deception and betrayal with four other students from their school. Despite being pitted against each other, the two once again work together in an effort to break the Box's hold. But as the stakes rise and the game grows increasingly twisted, it becomes clear that this is no ordinary wish-and that the owner may be impossible to convince. What kind of person could have created such a Box...?

Kazuki and Maria are still trapped in the vicious world of "Kingdom Royale," a game where murder seems to be the only path to victory. Kazuki swears he will find a way out of this particularly cruel Box, but first, he must discover the truth behind it...

Kazuki Hoshino encounters yet another Box--this time belonging to a friend. In order to cancel out this wish, Kazuki must finally use his own Box. But will it be enough...?

(Volume 1)Kazuki Hoshino leads the easy-going life of a typical high school student--until the appearance of a new girl in his class turns his world upside down! Introducing herself with a promise to "break" Kazuki is abnormal enough to make an impression, sure, but why does she seem so familiar...?

In the final volume of The Empty Box and Zeroth Maria, Kazuki makes his last stand against O to fulfill his vow to bring back the "zeroth" Maria-the real Maria. But what does fate have in store for them...?